Jancev, Simeon, Blagoj Pavlovski, and Ljupco Petreski. 2013. “Earthy–Cryptocrystalline Vivianite from the Trepel Deposits Near the Suvodol Village, Bitola, Macedonia”. Geologica Macedonica 25 (1), pp.61–65. https://js.ugd.edu.mk/index.php/GEOLMAC/article/view/270.